Thanks Dimo,
I contacted Siteground support, and I was able to get access to the site (kind of). However there’s something weird going on (which I don’t understand), but hopefully it’ll make sense to you.
In terms of access, I can only access the admin account as long as I sign in using a private browsing window in Firefox. I can’t sign in (and get the same error) if I sign in using a regular Firefox window. I also can’t sign in using Microsoft Edge (Chromium), whether in a regular or InPrivate window.
However, what is really curious is that the error is both present and the same, whether I’m accessing it using my work PC or my personal laptop at home. Two completely different machines, browsers, cookies, stored site data, ISPs and IP addresses – yet with the same problem. What’s even more puzzling is that my work colleague has no problems with accessing the same site admin with his login.
Surely that means that there must be something on the site, or being used by the plugin, that is preventing only me from signing in to the admin section?
It’s a real head-scratcher, and I thought it worth sharing this.
